Fix failing log rotation test

[rablador]

The test testRotatingActiveLogWhenSizeLimitIsExceeded has been failing on the CI for a while. This PR enables forced synchronization of the asynchronous writes in that tests and similar to it.

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This change is 

[linear]

IOS-844 Fix `testRotatingActiveLogWhenSizeLimitIsExceeded`

[pinkisemils]

Reviewed 4 of 4 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @rablador)

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ios/MullvadLogging/LogFileOutputStream.swift line 78 at r1 (raw file):

    }

    /// Waits for write operations to finish by issuing a synchronous closure.

Could do with explaining it should only be used in testing.

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ios/MullvadVPN.xcodeproj/project.pbxproj line 2500 at r1 (raw file):

			children = (
				44B02E3A2BC5732D008EDF34 /* LoggingTests.swift */,
				7AA513852BC91C6B00D081A4 /* LogRotationTests.swift */,

Thanks, Xcode.

[rablador]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @pinkisemils)

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ios/MullvadLogging/LogFileOutputStream.swift line 78 at r1 (raw file):

Previously, pinkisemils (Emīls Piņķis) wrote…

Could do with explaining it should only be used in testing.

Done.

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ios/MullvadVPN.xcodeproj/project.pbxproj line 2500 at r1 (raw file):

Previously, pinkisemils (Emīls Piņķis) wrote…

Thanks, Xcode.

No, I did that. We keep files ordered alphabetically, and these werent.

[pinkisemils]

Reviewable status: 3 of 4 files reviewed, all discussions resolved

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ios/MullvadVPN.xcodeproj/project.pbxproj line 2500 at r1 (raw file):

Previously, rablador (Jon Petersson) wrote…

No, I did that. We keep files ordered alphabetically, and these werent.

Oh, cool.

[pinkisemils]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

[buggmagnet]

Reviewable status: complete! all files reviewed, all discussions resolved

[github-actions]

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